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Good old RTFM... But reading the statement, if the insert trigger is last, then other triggers can fire and complete. I'll investigate this further. Thanks!
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François BeausoleilFeb 10 '12 at 3:30

@FrançoisBeausoleil: That's right. You can squeeze in other triggers on the same event before you cancel the INSERT with RETURN NULL. You could also put more program code into the same trigger function.
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Erwin BrandstetterFeb 10 '12 at 17:17